From nobody Mon Oct 18 13:10:11 2021 X-Original-To: dev-commits-src-main@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 06E731813D7D; Mon, 18 Oct 2021 13:10:14 +0000 (UTC) (envelope-from cy.schubert@cschubert.com) Received: from omta002.cacentral1.a.cloudfilter.net (omta002.cacentral1.a.cloudfilter.net [3.97.99.33]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "Client", Issuer "CA" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4HXy0P66SCz4gWg; Mon, 18 Oct 2021 13:10:13 +0000 (UTC) (envelope-from cy.schubert@cschubert.com) Received: from shw-obgw-4004a.ext.cloudfilter.net ([10.228.9.227]) by cmsmtp with ESMTP id c6DimkAQWps7PcSP7mGSyG; Mon, 18 Oct 2021 13:10:13 +0000 Received: from spqr.komquats.com ([70.66.148.124]) by cmsmtp with ESMTPA id cSP6m7oVva8XRcSP6mmUDZ; Mon, 18 Oct 2021 13:10:13 +0000 X-Authority-Analysis: v=2.4 cv=Ov8sdwzt c=1 sm=1 tr=0 ts=616d7235 a=Cwc3rblV8FOMdVN/wOAqyQ==:117 a=Cwc3rblV8FOMdVN/wOAqyQ==:17 a=kj9zAlcOel0A:10 a=8gfv0ekSlNoA:10 a=YxBL1-UpAAAA:8 a=6I5d2MoRAAAA:8 a=oCJs8q-oAAAA:8 a=EkcXrb_YAAAA:8 a=lYWpZslvAE-qNA2gE9QA:9 a=CjuIK1q_8ugA:10 a=UJ0tAi3fqDAA:10 a=Ia-lj3WSrqcvXOmTRaiG:22 a=IjZwj45LgO3ly-622nXo:22 a=qUF70SbvcHBaGhGVny9j:22 a=LK5xJRSDVpKd5WXXoEvA:22 Received: from slippy.cwsent.com (slippy [10.1.1.91]) by spqr.komquats.com (Postfix) with ESMTPS id A2200263; Mon, 18 Oct 2021 06:10:11 -0700 (PDT) Received: from slippy (localhost [127.0.0.1]) by slippy.cwsent.com (8.16.1/8.16.1) with ESMTP id 19IDABYd005908; Mon, 18 Oct 2021 06:10:11 -0700 (PDT) (envelope-from Cy.Schubert@cschubert.com) Message-Id: <202110181310.19IDABYd005908@slippy.cwsent.com> X-Mailer: exmh version 2.9.0 11/07/2018 with nmh-1.7.1 Reply-to: Cy Schubert From: Cy Schubert X-os: FreeBSD X-Sender: cy@cwsent.com X-URL: http://www.cschubert.com/ To: Warner Losh cc: Cy Schubert , Marcin Wojtas , src-committers , "" , dev-commits-src-main@freebsd.org Subject: Re: git: 889b56c8cd84 - main - setrlimit: Take stack gap into account. In-reply-to: References: <202110150823.19F8NEr9047194@gitrepo.freebsd.org> <202110161602.19GG2FYs004292@slippy.cwsent.com> Comments: In-reply-to Warner Losh message dated "Mon, 18 Oct 2021 07:03:29 -0600." List-Id: Commit messages for the main branch of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-main List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-main@freebsd.org X-BeenThere: dev-commits-src-main@freebsd.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Mon, 18 Oct 2021 06:10:11 -0700 X-CMAE-Envelope: MS4xfHOq2+XhK3NvqIqSNoPxGrc7cG2ZWu0LATSbjfiOT+pHENzlcqKU4h4z003n4OZ0ouV3NZGTultcQwlEWDvoAE78BCz0ABuJTi/cu3owZT/lgcc35pGF NUji0TDndOWbaPaZ85Ewo/09ZfxkW/GN80M8IUsjXnM7iryqHEhAmfHfiu1NAzJ1DO/+Zb3LAQ4diEpxxYMNmHRNUjjp4sCAdB4RgwhR9jgjkiwcQlVMGaH3 GGEkvFK6hlZoGRtS/aWHBgMGU+BNgMVYzNac2P50yQi0uxoLlBFJD7ZKBk1ZoadP0rCohYf57mO8Qc0A27CKNO9xDrrk3vxP4SswKSLHZJVon4c5kIzEvbJ6 gGzsXCgf X-Rspamd-Queue-Id: 4HXy0P66SCz4gWg X-Spamd-Bar: ---- Authentication-Results: mx1.freebsd.org; none X-Spamd-Result: default: False [-4.00 / 15.00]; REPLY(-4.00)[] X-ThisMailContainsUnwantedMimeParts: N In message , Warner Losh writes: > On Sat, Oct 16, 2021, 10:02 AM Cy Schubert > wrote: > > > In message <202110150823.19F8NEr9047194@gitrepo.freebsd.org>, Marcin > > Wojtas > > wri > > tes: > > > The branch main has been updated by mw: > > > > > > URL: > > https://cgit.FreeBSD.org/src/commit/?id=889b56c8cd84c9a9f2d9e3b019c154d6 > > > f14d9021 > > > > > > commit 889b56c8cd84c9a9f2d9e3b019c154d6f14d9021 > > > Author: Dawid Gorecki > > > AuthorDate: 2021-10-13 19:01:08 +0000 > > > Commit: Marcin Wojtas > > > CommitDate: 2021-10-15 08:21:47 +0000 > > > > > > setrlimit: Take stack gap into account. > > > > > > Calling setrlimit with stack gap enabled and with low values of stack > > > resource limit often caused the program to abort immediately after > > > exiting the syscall. This happened due to the fact that the resource > > > limit was calculated assuming that the stack started at sv_usrstack, > > > while with stack gap enabled the stack is moved by a random number > > > of bytes. > > > > > > Save information about stack size in struct vmspace and adjust the > > > rlim_cur value. If the rlim_cur and stack gap is bigger than > > rlim_max, > > > then the value is truncated to rlim_max. > > > > > > PR: 253208 > > > Reviewed by: kib > > > Obtained from: Semihalf > > > Sponsored by: Stormshield > > > MFC after: 1 month > > > Differential Revision: https://reviews.freebsd.org/D31516 > > > --- > > > sys/kern/imgact_elf.c | 5 +++-- > > > sys/kern/kern_exec.c | 11 ++++++++--- > > > sys/kern/kern_resource.c | 3 +++ > > > sys/sys/imgact_elf.h | 2 +- > > > sys/sys/sysent.h | 2 +- > > > sys/vm/vm_map.c | 2 ++ > > > sys/vm/vm_map.h | 1 + > > > 7 files changed, 19 insertions(+), 7 deletions(-) > > > > > > diff --git a/sys/kern/imgact_elf.c b/sys/kern/imgact_elf.c > > > index ef1edfcabaf0..898f0f66a532 100644 > > > --- a/sys/kern/imgact_elf.c > > > +++ b/sys/kern/imgact_elf.c > > > @@ -2684,7 +2684,7 @@ __elfN(untrans_prot)(vm_prot_t prot) > > > return (flags); > > > } > > > > > > -void > > > +vm_size_t > > > __elfN(stackgap)(struct image_params *imgp, uintptr_t *stack_base) > > > { > > > uintptr_t range, rbase, gap; > > > @@ -2692,7 +2692,7 @@ __elfN(stackgap)(struct image_params *imgp, > > uintptr_t * > > > stack_base) > > > > > > pct = __elfN(aslr_stack_gap); > > > if (pct == 0) > > > - return; > > > + return (0); > > > if (pct > 50) > > > pct = 50; > > > range = imgp->eff_stack_sz * pct / 100; > > > @@ -2700,4 +2700,5 @@ __elfN(stackgap)(struct image_params *imgp, > > uintptr_t * > > > stack_base) > > > gap = rbase % range; > > > gap &= ~(sizeof(u_long) - 1); > > > *stack_base -= gap; > > > + return (gap); > > > } > > > diff --git a/sys/kern/kern_exec.c b/sys/kern/kern_exec.c > > > index 50e75fda6cfb..9dceebdd8441 100644 > > > --- a/sys/kern/kern_exec.c > > > +++ b/sys/kern/kern_exec.c > > > @@ -1148,6 +1148,7 @@ exec_new_vmspace(struct image_params *imgp, struct > > syse > > > ntvec *sv) > > > stack_prot, error, vm_mmap_to_errno(error)); > > > return (vm_mmap_to_errno(error)); > > > } > > > + vmspace->vm_stkgap = 0; > > > > > > /* > > > * vm_ssize and vm_maxsaddr are somewhat antiquated concepts, but > > they > > > @@ -1493,12 +1494,16 @@ exec_args_get_begin_envv(struct image_args *args) > > > void > > > exec_stackgap(struct image_params *imgp, uintptr_t *dp) > > > { > > > + struct proc *p = imgp->proc; > > > + > > > if (imgp->sysent->sv_stackgap == NULL || > > > - (imgp->proc->p_fctl0 & (NT_FREEBSD_FCTL_ASLR_DISABLE | > > > + (p->p_fctl0 & (NT_FREEBSD_FCTL_ASLR_DISABLE | > > > NT_FREEBSD_FCTL_ASG_DISABLE)) != 0 || > > > - (imgp->map_flags & MAP_ASLR) == 0) > > > + (imgp->map_flags & MAP_ASLR) == 0) { > > > + p->p_vmspace->vm_stkgap = 0; > > > return; > > > - imgp->sysent->sv_stackgap(imgp, dp); > > > + } > > > + p->p_vmspace->vm_stkgap = imgp->sysent->sv_stackgap(imgp, dp); > > > } > > > > > > /* > > > diff --git a/sys/kern/kern_resource.c b/sys/kern/kern_resource.c > > > index 4c62961e1bc4..b556d4fded51 100644 > > > --- a/sys/kern/kern_resource.c > > > +++ b/sys/kern/kern_resource.c > > > @@ -671,6 +671,9 @@ kern_proc_setrlimit(struct thread *td, struct proc > > *p, u_ > > > int which, > > > if (limp->rlim_max < 0) > > > limp->rlim_max = RLIM_INFINITY; > > > > > > + if (which == RLIMIT_STACK && limp->rlim_cur != RLIM_INFINITY) > > > + limp->rlim_cur += p->p_vmspace->vm_stkgap; > > > + > > > oldssiz.rlim_cur = 0; > > > newlim = lim_alloc(); > > > PROC_LOCK(p); > > > diff --git a/sys/sys/imgact_elf.h b/sys/sys/imgact_elf.h > > > index 97383c6eeeb8..294f17c87b6f 100644 > > > --- a/sys/sys/imgact_elf.h > > > +++ b/sys/sys/imgact_elf.h > > > @@ -118,7 +118,7 @@ int __elfN(remove_brand_entry)(Elf_Brandinfo > > *entry > > > ); > > > int __elfN(freebsd_fixup)(uintptr_t *, struct image_params *); > > > int __elfN(coredump)(struct thread *, struct vnode *, off_t, int); > > > size_t __elfN(populate_note)(int, void *, void *, size_t, void > > **); > > > -void __elfN(stackgap)(struct image_params *, uintptr_t *); > > > +vm_size_t __elfN(stackgap)(struct image_params *, uintptr_t *); > > > int __elfN(freebsd_copyout_auxargs)(struct image_params *, uintptr_t); > > > void __elfN(puthdr)(struct thread *, void *, size_t, int, size_t, int); > > > void __elfN(prepare_notes)(struct thread *, struct note_info_list *, > > > diff --git a/sys/sys/sysent.h b/sys/sys/sysent.h > > > index ad50bf56e87d..ea96c87a79af 100644 > > > --- a/sys/sys/sysent.h > > > +++ b/sys/sys/sysent.h > > > @@ -119,7 +119,7 @@ struct sysentvec { > > > void (*sv_elf_core_prepare_notes)(struct thread *, > > > struct note_info_list *, size_t *); > > > int (*sv_imgact_try)(struct image_params *); > > > - void (*sv_stackgap)(struct image_params *, uintptr_t *); > > > + vm_size_t (*sv_stackgap)(struct image_params *, uintptr_t *); > > > int (*sv_copyout_auxargs)(struct image_params *, > > > uintptr_t); > > > int sv_minsigstksz; /* minimum signal stack size */ > > > diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c > > > index 1ac4ccf72f11..87a290b998b9 100644 > > > --- a/sys/vm/vm_map.c > > > +++ b/sys/vm/vm_map.c > > > @@ -343,6 +343,7 @@ vmspace_alloc(vm_offset_t min, vm_offset_t max, > > pmap_pini > > > t_t pinit) > > > vm->vm_taddr = 0; > > > vm->vm_daddr = 0; > > > vm->vm_maxsaddr = 0; > > > + vm->vm_stkgap = 0; > > > return (vm); > > > } > > > > > > @@ -4265,6 +4266,7 @@ vmspace_fork(struct vmspace *vm1, vm_ooffset_t > > *fork_ch > > > arge) > > > vm2->vm_taddr = vm1->vm_taddr; > > > vm2->vm_daddr = vm1->vm_daddr; > > > vm2->vm_maxsaddr = vm1->vm_maxsaddr; > > > + vm2->vm_stkgap = vm1->vm_stkgap; > > > vm_map_lock(old_map); > > > if (old_map->busy) > > > vm_map_wait_busy(old_map); > > > diff --git a/sys/vm/vm_map.h b/sys/vm/vm_map.h > > > index ace205b21b42..873ff62eec4a 100644 > > > --- a/sys/vm/vm_map.h > > > +++ b/sys/vm/vm_map.h > > > @@ -293,6 +293,7 @@ struct vmspace { > > > caddr_t vm_taddr; /* (c) user virtual address of text */ > > > caddr_t vm_daddr; /* (c) user virtual address of data */ > > > caddr_t vm_maxsaddr; /* user VA at max stack growth */ > > > + vm_size_t vm_stkgap; /* stack gap size in bytes */ > > > u_int vm_refcnt; /* number of references */ > > > /* > > > * Keep the PMAP last, so that CPU-specific variations of that > > > > > > > Is it possible to have a __FreeBSD_version bump for ports? > > > > There was a bump for linuxkpi you should use for this. It was a day or so > after the stackgap change. That's the one I intend to use. I used the prior one at the time but will update the patch to use this one instead. Probably today sometime. -- Cheers, Cy Schubert FreeBSD UNIX: Web: https://FreeBSD.org NTP: Web: https://nwtime.org The need of the many outweighs the greed of the few.